31140480 has 192 divisors, whose sum is σ = 115814880. Its totient is φ = 7096320.

The previous prime is 31140469. The next prime is 31140493. The reversal of 31140480 is 8404113.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93915 + ... + 94245.

Almost surely, 2^31140480 is an apocalyptic number.

31140480 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31140480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57907440).

31140480 is an abundant number, since it is smaller than the sum of its proper divisors (84674400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31140480 is a wasteful number, since it uses less digits than its factorization.

31140480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31140480 is about 5580.3655794222. The cubic root of 31140480 is about 314.6118676318.

Adding to 31140480 its reverse (8404113), we get a palindrome (39544593).

The spelling of 31140480 in words is "thirty-one million, one hundred forty thousand, four hundred eighty".